毕业论文--低温储罐用钢焊接工艺研究.doc

摘 要液化石油气(LPG)具有燃烧值高，对大气无污染等特点，被誉为洁净的绿色能源,它还是优质的化工原料，因此，LPG越来越得到广泛地应用。但是LPG的缺点是易燃、易爆、相态易变等，一般采用低温液化储存。随着液化石油气行业的发展，LPG低温储罐的建设，逐渐引起人们的广泛关注。本文主要研究了低温储罐用钢的焊接性能，分析了低温储罐用钢的服役环境。通过多方比较，选择09MnNiDR钢作为低温储罐用钢的焊接材料。通过对焊接接头的组织和性能进行实验研究，确定焊接工艺要点，包括选择焊接方法，选择焊接材料，进行焊接工艺评定分析，对低温用钢焊接接头进行试验，对其金相组织进行分析，对其硬度进行测定，研究低温用钢的金属焊接性，正确选择预热温度和焊后热处理等，制定出合理的09MnNiDR钢的焊接工艺。关键词：低温储罐；09MnNiDR；焊接性；工艺评定 AbstractLiquefied petroleum gas (LPG) with a high combustion value, no pollution to the atmosphere, known as a clean and green energy, it is also a high quality chemical raw materials, therefore, LPG has been more widely used. But the disadvantage of LPG is flammable, explosive, volatile phase etc, normally utilize liquid storage. With the development of liquefied petroleum gas industry, LPG storage tanks at low temperature construction, has gradually attract peoples attention. This paper studies the low-temperature storage tank of steel’s welding performance and service environment. Through various comparison, select 09MnNiDR steel as low-temperature storage tanks welding material. On microstructure and properties of welded joints to conduct experimental research to determine the welding process elements, including the choice of welding method, welding material selection, welding procedure qualification analysis, study on welded joints of low-temperature steel, analysis the microstructure, test the hardness, measure the metal welding of low temperature steel, and choice the correct preheating temperature and post weld heat treatment etc, to draw up a reasonable welding process of 09MnNiDR steel.Key word：low-temperature storage tank；09MnNiDR；welding property； process analysis目 录 TOC \o 1-2 \h \z \u HYPERLINK \l _Toc296758304 第1章 绪论 PAGEREF _Toc296758304 \h 1 HYPERLINK \l _Toc296758305 1.1 低温储罐在工业生产中的应用 PAGEREF _Toc296758305 \h 1 HYPERLINK \l _Toc296758306 1.2 低温储罐用钢概况 PAGEREF _Toc296758306 \h 2 HYPERLINK \l _Toc296758307 1.3 本课题研究的意义及内容 PAGEREF _Toc296758307 \h 2 HYPERLINK \l _Toc296758308 第